You might recall that School of Ants is a citizen science program based at North Carolina State University (earlier post).
Last week I received the kit in the mail.
Each kit comes with four vials with blue caps, four vials with red caps and one large tube with an orange cap. The red and blue-capped vials come baited with cookie crumbs and are to be placed in specific setting. The orange-capped tube is for anything else you would like to have identified.
The next day I placed the open vials outside as directed.
The southern fire ants were happy to cooperate and soon were carting away bait.
I thought this was a perfect opportunity to learn more about ant ecology.
Ecologists who study interference competition often use baits. They recognize three strategies used by ants in finding and taking baits:
- Opportunists- able to find baits quickly, but don’t defend it
- Extirpators- may take longer to find bait, but recruit higher numbers and defend the bait (often have soldier caste)
- Insinuators – ant species that are too small in size and number to be noticed by extirpators
In this case the southern fire ants found the baits quickly, and were also defending. They definitely fit the definition of extirpators.
What about the tiny rover ants that are also found in the yard? Are they small enough to be insinuators?
Notice the rover on the top of the vial? Those are fire ants on the rim.
Will the defender ignore the rover ant?
No, the defender fire ant charges the rover ant and chases it away.
Let’s take a look in another tube.
Once again the rover ant approaches from the top.
Along comes the fire ant…
and chases it away.
In the end, the southern fire ants were able to dominate the baits. Looks like rover ants are opportunists rather than insinuators, in spite of their small size and lower numbers.
The bottom line is that baited vials are definitely useful for learning more about the ants in your area.
I would recommend this project. You do need to provide an envelope and postage to send the vials back, but otherwise time is the main investment. If you decide to take part in School of Ants, I’d love to hear what you find out.
Reference: Parr, C. L. and H. Gibb. Competition and the Role of Dominant Ants, Chapter 5. In: Lach, L. Parr, C.L. and K.L. Abbott., eds. 2010. Ant Ecology. Oxford University Press, Oxford.